What if there's something we're not really seeing?

Ok, bear with me in this one: Remember how on TS3 there was always a certain hint of a future EP in the game? Like the movie posters at the theater, sometimes it was something decorative (like the Servo statue easter egg at the science lab, same robot that would come in Ambitions). I remember there were talks months after an EP came out, I don't know if it was Generations or Seasons, that was hinting pretty specifically to the following EPs, but we never noticed until they all were out.

What if there's a clue to the first EP right before our eyes in the game and we just haven't noticed it yet?

If so, what could these clues be?

Please understand this is not supposed to create any conspiracy theories about the game, I just know there are fans of the game out there who, just like me, like a good old speculation/easter egg hunt.